d-Color MF4003/MF3303
P THEORY OF OPERATION > 8. FK-517
P-98
b0 b1 b2 b3 b4 b5 b6 b7 Meaning Item No.
0/1 V23 half-duplex ability disabled / enabled 11
0/1 V21 ability disabled / enabled 12
(c)Protocols (1 octet)
b0 b1 b2 b3 b4 b5 b6 b7 Meaning
0 1 0 1 0 (Protocols category tag)
1 0 0 V42 LAPM protocol
1 1 1 Protocol represented by expanding octet
• (Other than the above = Reserved)
(d)GSTN access (1 octet)
b0 b1 b2 b3 b4 b5 b6 b7 Meaning
1 0 1 1 0 (GSTN access category tag)
0/1 Celluler connection in the calling side
0/1 Celluler connection in the called side
0/1 0: Analog network connection
1: Digital network connection
(e)PCM modem capability (1 octet)
b0 b1 b2 b3 b4 b5 b6 b7 Meaning
1 1 1 0 0 (PCM modem category tag)
0/1 V.90 analog modem capability
0/1 V.90 digital modem capability
0/1 V.91 capability
(5)Phase 2 (Probing) ..... V.34 basic setting
• Exchange of modulation ability
• Measurement of line characteristics (bi-direction)
• Determination and exchange of compensation values to line characteristics (compensation values of maximum data rate, transmission
level, pre-emphasis (*))
• *: linear equalizer for compensating amplitude distortion
Calling
Called
*1
70 5 ms
IN
FO0
c
B
B
L1
L2
B
160 ms10 ms
550 ms+RTDEc or less
INFO0a
A
A
INFOh
A
*2
10 ms
50 ms or more
40 10 ms
670 m
s or less
25 ms
To Phase 3
A • 2400 Hz tone signal output from the called side (Level is a set value -1 dB).
• 1800 Hz guard tone (Level is a set value -7 dB) is output simultaneously from the called side.
• 2400 Hz tone signal output from the called side (Phase inversion of A).
• 1800 Hz guard tone.
B 1200 Hz tone signal output from the called side.
1200 Hz tone signal output from the calling side (Phase inversion of B).
INFO 0x Binary signal for indicating auto modulation option signal (x=a/c: a: called side, c: calling side)
L1, L2 Signal for conditioning line characteristics (tone
synthesis at the interval of 150 Hz from 150 to 3750 Hz
(except for 900, 1200, 1800 and 2400 Hz))
• L1: 160 ms, Level= Set value+6dB
• L2: Maximum 550 ms+TRDEx, Level = Set value
INFO h Binary signal for indicating parameters used in Phase 3 (training of main channel equalizer). This signal is sent from a modem
receiving main channel data to a transmitting modem.
• *1: INFO 0c Bit 28 OFF
• *2: INFO 0a Bit 28 OFF
(a)<INFO 0x Bit Assignment>
Bits (LSB-MSB) Value Meaning
0-3 1111 Fill Bits
4-11 01110010 Bit string for frame synchronization
12 0/1 2743 symbol / sec support • 0: No
• 1: Yes
13 0/1 2800 symbol / sec support • 0: No
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